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H. G. HART 8v J. W. CROSS.

` SPRING HINGE. No. 269,411. Patented Deo. 19, '18821.

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N. PETERS.

UNITED STATES PATENT OEEICE.

HENRY C. HART AND JAMES W. CROSS, OF DETROIT, MICHIGAN, ASSIGN- ORS TO THE CLARK HARDVARE SPRING- COMPANY, OF .SAME PLAGE.

HINGE.

SPECIFICATION forming' part of Letters Patent No. 269,411, dated December 19,1882, Application filed September' 29, 1882. (Model.)

'To all whom it may concern:

following is a specification.

' being such that the collar is lifted from its en- -1851, to Messrs; Clark and Hart, in which the objections and to provide such a construction Thisinvention relates to improvements in the spring-hinge for which Letters Patent No. 244,185 were/issued on the 12th day of July,l

hinge is composed of two leaves, having eyed lugs, through which passesaconnecting-pintle providedwith alongitudinal groove in its lower end, a ratchet-collar being arranged on the pintle and having an interior lug to engage the groove, said collar being caused to automatically engage a stationary stop on the eye of one hinge-leaf, and adapted to rotate with but slide along the pintle when the latteris rotated to tighten up or increase the tension ot' the spring. In the practical use of such hinges objections exist in that it is difticult to relieve or release thetension ot' the coiled spring which throws theratchet-collar into engagemen t with the stationary stop, and the pintle is liable to work vertically out of proper position.

The object of our invention is to avoid these of pintle that when rotated in one direction the ratchet-collar will he turned to tighten up the coiled spring and increase its tension 5 but when rotated in the opposite direction 4the ratchet will he lifted from engagement with the ordinary stop, and the tension of the spring be thereby relieved or released, the operation gagement with the stop to permit one tooth to ride over the latter in adirection to relieve the tension ot' the spring, when the longitudinal elasticity of the latter will again throw the collar into engagement until the pintle is again rotated to again lift the collar and permit one tooth to ride over the stop, such movements being repeated until the tension of the spring is relieved tothe required extent.

The object ot' our invention we accomplish in the manner and by the means hereinafter explained, and illustrated'in drawings, in which- Figure l represents a plan view ofa springhinge embodying our invention; Fig. 2, a broken perspective view of the pint-le, the lower portion of one ofthe hinge-leaves and the ratchet-collar, these parts being separated to more cleariyshow theconstruction ofthe pintle; Fig. 3, a view of the parts shown in Fig. 2, when arranged together for operation, the pintle being in the position it occupies when it is rotated to tighten up or increase the tension of the spring; and Fig. 4, a View similar to Fig. 3, showing the position of the parts when the pintle is rotated to lift the ratchet-collar, and thereby disengage it from the stationary stop, to permit the spring to expandand relieve its tension.

he hinge herein shown is in all respects the accompanying i identical with the hinge forming the subject matter of the Letters Patent before mentioned,

except in the construction ot' the pintle and the manner ot' operating the ratchet-collar to relieve or release the tension of the spring.

The numbers l indicate the leaves; 2, the eyed lugs; 3, the ratchet-collar; 4, its interior lug; 6,thestationary stop with which theratchet-collar engages, and 7 the coiled spring, the upper end ot' which sets within a collar, 8,

while its lower end rests Within the ratchet.

collar and is secured thereto by end through a slot in the same.

The pintle 9 is provided with the longitudinal groove or recess 11, the upper or inner end of which terminates in a groove orY recess, 12, which extends transversely in a straight direction around the pintle and forms the shoulder 13. At the upper end of the longitudinal groove or recess is provided a recess, 14, which is arranged to extend diagonally or obliquely in a direction around the pintle in such a manner as to form the diagonal or inclined camshonlder l5.

When the parts are in proper relative position, and it is desired to tighten up the tension ofthe spring, the pintle will be rotated in the direction ofthe arrow, Fig. 3, which causes the straight transverse groove or recess 12 to pass extending its over the interior lug, 4, of the ratchet-collar until the said lug bears against the vertical shoulder or termination 13 of the said groove or recess 12, when a continued rotation ot' the pintle will turn the collar and cause its teeth to successively ride over and engage the stationary stop 6, and this is repeated until the required tension is obtained. The formation ot the straight transverse groove or recess 12 is such that when the required tension of the spring is obtained the lug 4 of the collar will he retained in said groove or recess with sufricient firmness as to preventits accidental rotation and vertical displacement, the shoulder 13 coming under thevbottom edge ofthe lug 4, and thereby preventing the pintle from working vertically.

It at any time it becomes necessary to relieve or release thetension of the coiled spring, this can be quickly performed by rotating the pintle in a reverse direction, as represented by the arrow in Fig. 4. which causesthe interior lug on the collar to enter the diagonal or oblique groove or recess 14 and engage the incline or cam shoulder 15, which latter, by the continued rotation of the pintle, acts on the lug in such manner as to lift the collar until one of its teeth is permitted to pass by the stationary stop 6, when the longitudinal elasticity of' the coiled spring Will immediately throw the collar again into engagement with the stop, the lug on the collar in such movement returning down the incline or cam-shoulder 15. The continued rotation ot' the pintle in this manner successively lifts the ratchet-collar from engagement with the stop and permits its teeth to successively ride over and engage the said stop, the coiled spring acting to relieve its tension, and by its expansion causingr the lug on the collar to descend the incline or cam shoulder in effecting the successive engagements ot' the collar and the stop.

Having thus described our invention, what We claim is- 1. rlhe combination, with the coiled spring and the collar having an interior lugand adapted to engage a locking-stop, of a pintle having a diagonal or oblique groove or recess at the upper portion of its longitudinal groove to form an incline or cam projection, which serves to 'lift the collar from enga-gement with the stop when the pintle is rotated in one direction, substantially as described.

2. The combination, with the coiled spring and the collar having an interior lug and adapted to engage alocking-stop, ot' a pintle having a straight transverse groove or recess and a diagonal or oblique groove or recess at the upper portion of its longitudinal groove to forni the pintle-retaining shoulder and the collarlifting incline or cam, substantially as de scribed.

In testimony' whereof we have hereunto set1 A our hands in the presence ot' two subscribing' witnesses.

HENRY C. HART. vJAS. W. GROSS. Witnesses:

RoBr. A. LIGGE'r'r, JAS. B. OaMisToN. 

